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Scientific Linux Security Update : nss_ldap on SL4.x i386/x86_64

This script is Copyright (C) 2012 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing a security update.

Description :

A race condition was discovered in nss_ldap, which affected certain
applications that make LDAP connections, such as Dovecot. This could
cause nss_ldap to answer a request for information about one user with
the information about a different user. (CVE-2007-5794)

As well, this updated package fixes the following bugs :

- in certain situations, on Itanium(R) architectures, when
an application performed an LDAP lookup for a highly
populated group, for example, containing more than 150
members, the application crashed, or may have caused a
segmentation fault. As well, this issue may have caused
commands, such as 'ls', to return a 'ber_free_buf:
Assertion' error.

- when an application enumerated members of a netgroup,
the nss_ldap module returned a successful status result
and the netgroup name, even when the netgroup did not
exist. This behavior was not consistent with other
modules. In this updated package, nss_ldap no longer
returns a successful status when the netgroup does not
exist.

- in master and slave server environments, with systems
that were configured to use a read-only directory
server, if user log in attempts were denied because
their passwords had expired, and users attempted to
immediately change their passwords, the replication
server returned an LDAP referral, instructing the
pam_ldap module to resissue its request to a different
server
however, the pam_ldap module failed to do so. In
these situations, an error such as the following
occurred :

In this updated package, password changes are allowed when binding
against a slave server, which resolves this issue.

- when a system used a directory server for naming
information, and 'nss_initgroups_ignoreusers root' was
configured in '/etc/ldap.conf', dbus-daemon-1 would
hang. Running the 'service messagebus start' command did
not start the service, and it did not fail, which would
stop the boot process if it was not cancelled.

As well, this updated package upgrades nss_ldap to the version as
shipped with Scientific Linux 5.

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